How to use an if statement with base_url() in PHP? - php

Question

I want to insert in my db the date of creation of an object form only if the base_url is equal to insertobject ! to be more clear i dont want to insert the date if i'm in update mode my code right now is inserting the date even when i'm updating.
<form method="post" id="object_add" class="card" action="<?php echo base_url();?>object/<?php echo (isset($objectdetails))?'updateobject':'insertobject'; ?>">
<input type="hidden" id="obj_created_date" name="obj_created_date" value="<?php echo date('Y-m-d H:i:s'); ?>">
</form>
Here is my main code :
<form method="post" id="vehicle_add" class="card" action="<?php echo base_url();?>vehicle/<?php echo (isset($vehicledetails))?'updatevehicle':'insertvehicle'; ?>">
<div class="card-body">
<div class="row">
<?php if(isset($vehicledetails)) { ?>
<input type="hidden" name="v_id" id="v_id" value="<?php echo (isset($vehicledetails)) ? $vehicledetails[0]['v_id']:'' ?>" >
<?php } ?>
<div class="col-sm-6 col-md-4">
<label class="form-label">Registration Number</label>
<div class="form-group">
<input type="text" name="v_registration_no" id="v_registration_no" class="form-control" placeholder="Registration Number" value="<?php echo (isset($vehicledetails)) ? $vehicledetails[0]['v_registration_no']:'' ?>">
</div>
</div>
<div class="col-sm-6 col-md-4">
<label class="form-label">Vehicle Name</label>
<div class="form-group">
<input type="text" name="v_name" id="v_name" class="form-control" placeholder="Vehicle Name" value="<?php echo (isset($vehicledetails)) ? $vehicledetails[0]['v_name']:'' ?>">
</div>
</div>
<div class="col-sm-6 col-md-4">
<div class="form-group">
<label class="form-label">Model</label>
<input type="text" name="v_model" value="<?php echo (isset($vehicledetails)) ? $vehicledetails[0]['v_model']:'' ?>" class="form-control" placeholder="Model">
</div>
</div>
<input type="hidden" id="obj_created_date" name="obj_created_date" value="<?php echo date('Y-m-d H:i:s'); ?>">
</form>
Any hero to save my day ??